I have information to contribute to the profile of Henry Anderson. This is what I can add:
These are the sources I am using: I am unable to find any sources to indicate that he his African-American.
Should I contact one of the pre-1700 projects or know about any style guidelines before proceeding? Thank you!
This wikitree help page should answer your question
https://www.wikitree.com/wiki/Help:Pre-1700_Profiles